NS2.26SourcesOriginal: DelAckSink class Reference

00373                                    : TcpSink(acker), delay_timer_(this)
00374 {
00375         bind_time("interval_", &interval_);
00376         bind("bytes_", &bytes_); // useby JOBS
00377 }

00255 {
00256         Packet* npkt = allocpkt();
00257         // opkt is the "old" packet that was received
00258         // npkt is the "new" packet being constructed (for the ACK)
00259         double now = Scheduler::instance().clock();
00260         hdr_flags *sf;
00261 
00262         hdr_tcp *otcp = hdr_tcp::access(opkt);
00263         hdr_ip *oiph = hdr_ip::access(opkt);
00264         hdr_tcp *ntcp = hdr_tcp::access(npkt);
00265 
00266         if (qs_enabled_) {
00267                 // QuickStart code from Srikanth Sundarrajan.
00268                 hdr_qs *oqsh = hdr_qs::access(opkt);
00269                 hdr_qs *nqsh = hdr_qs::access(npkt);
00270                 if (otcp->seqno() == 0 && oqsh->flag() == QS_REQUEST) {
00271                         nqsh->flag() = QS_RESPONSE;
00272                         nqsh->ttl() = (oiph->ttl() - oqsh->ttl()) % 256;
00273                         nqsh->rate() = (oqsh->rate() < MWS) ? oqsh->rate() : MWS;
00274                 }
00275                 else {
00276                         nqsh->flag() = QS_DISABLE;
00277                 }
00278         }
00279 
00280 
00281         // get the tcp headers
00282         ntcp->seqno() = acker_->Seqno();
00283         // get the cumulative sequence number to put in the ACK; this
00284         // is just the left edge of the receive window - 1
00285         ntcp->ts() = now;
00286         // timestamp the packet
00287 
00288         if (ts_echo_bugfix_)  /* TCP/IP Illustrated, Vol. 2, pg. 870 */
00289                 ntcp->ts_echo() = acker_->ts_to_echo();
00290         else
00291                 ntcp->ts_echo() = otcp->ts();
00292         // echo the original's time stamp
00293 
00294         hdr_ip* oip = hdr_ip::access(opkt);
00295         hdr_ip* nip = hdr_ip::access(npkt);
00296         // get the ip headers
00297         nip->flowid() = oip->flowid();
00298         // copy the flow id
00299         
00300         hdr_flags* of = hdr_flags::access(opkt);
00301         hdr_flags* nf = hdr_flags::access(npkt);
00302         if (save_ != NULL) 
00303                 sf = hdr_flags::access(save_);
00304                 // Look at delayed packet being acked. 
00305         if ( (save_ != NULL && sf->cong_action()) || of->cong_action() ) 
00306                 // Sender has responsed to congestion. 
00307                 acker_->update_ecn_unacked(0);
00308         if ( (save_ != NULL && sf->ect() && sf->ce())  || 
00309                         (of->ect() && of->ce()) )
00310                 // New report of congestion.  
00311                 acker_->update_ecn_unacked(1);
00312         if ( (save_ != NULL && sf->ect()) || of->ect() )
00313                 // Set EcnEcho bit.  
00314                 nf->ecnecho() = acker_->ecn_unacked();
00315         if (!of->ect() && of->ecnecho() ||
00316                 (save_ != NULL && !sf->ect() && sf->ecnecho()) ) 
00317                  // This is the negotiation for ECN-capability.
00318                  // We are not checking for of->cong_action() also. 
00319                  // In this respect, this does not conform to the 
00320                  // specifications in the internet draft 
00321                 nf->ecnecho() = 1;
00322         acker_->append_ack(hdr_cmn::access(npkt),
00323                            ntcp, otcp->seqno());
00324         add_to_ack(npkt);
00325         // the above function is used in TcpAsymSink
00326         
00327         send(npkt, 0);
00328         // send it
00329 }

00332 {
00333         return;
00334 }

00327 {
00328         char wrk[256];
00329         int n;
00330         double curTime = (&Scheduler::instance() == NULL ? 0 : 
00331                           Scheduler::instance().clock());
00332         
00333         sprintf(wrk, "a -t "TIME_FORMAT" -s %d -d %d -n %s",
00334                 curTime, here_.addr_, dst_.addr_, name);
00335         n = strlen(wrk);
00336         wrk[n] = '\n';
00337         wrk[n+1] = 0;
00338         if (channel_)
00339                 (void)Tcl_Write(channel_, wrk, n+1);
00340         // keep agent trace name
00341         if (traceName_ != NULL)
00342                 delete[] traceName_;
00343         traceName_ = new char[strlen(name)+1];
00344         strcpy(traceName_, name);
00345 }

00096 { return here_.addr_; }

00518 {
00519         Packet* p = allocpkt();
00520 
00521         if (n > 0)
00522                 p->allocdata(n);
00523 
00524         return(p);
00525 }

00507 {
00508         Packet* p = Packet::alloc();
00509         initpkt(p);
00510         return (p);
00511 }

00373 {
00374         app_ = app;
00375 }

00230 {
00231         if (argc == 2) {
00232                 if (strcmp(argv[1], "reset") == 0) {
00233                         reset();
00234                         return (TCL_OK);
00235                 }
00236                 if (strcmp(argv[1], "resize_buffers") == 0) {
00237                         // no need for this as seen buffer set dynamically
00238                         fprintf(stderr,"DEPRECIATED: resize_buffers\n");
00239                         return (TCL_OK);
00240                 }
00241         }
00242 
00243         return (Agent::command(argc, argv));
00244 }

00390 {
00391 /*
00392         dst_ = dst;
00393 */
00394 }

00098 { return dst_.addr_; }

00103 {
00104         if (!debug_)
00105                 return;
00106         va_list ap;
00107         va_start(ap, fmt);
00108         vprintf(fmt, ap);
00109 }

00207 {
00208         if (delay_bind(varName, localName, "packetSize_", &size_, tracer)) return TCL_OK;
00209         if (delay_bind_bool(varName, localName, "ts_echo_bugfix_", &ts_echo_bugfix_, tracer)) return TCL_OK;
00210         if (delay_bind_bool(varName, localName, "generateDSacks_", &generate_dsacks_, tracer)) return TCL_OK;
00211         if (delay_bind_bool(varName, localName, "qs_enabled_", &qs_enabled_, tracer)) return TCL_OK;
00212         if (delay_bind_bool(varName, localName, "RFC2581_immediate_ack_", &RFC2581_immediate_ack_, tracer)) return TCL_OK;
00213 #if defined(TCP_DELAY_BIND_ALL) && 0
00214         if (delay_bind(varName, localName, "maxSackBlocks_", &max_sack_blocks_, tracer)) return TCL_OK;
00215 #endif /* TCP_DELAY_BIND_ALL */
00216 
00217         return Agent::delay_bind_dispatch(varName, localName, tracer);
00218 }

00191 {
00192         delay_bind_init_one("packetSize_");
00193         delay_bind_init_one("ts_echo_bugfix_");
00194         delay_bind_init_one("bytes_"); // For throughput measurements in JOBS
00195         delay_bind_init_one("generateDSacks_"); // used only by sack
00196         delay_bind_init_one("qs_enabled_");
00197         delay_bind_init_one("RFC2581_immediate_ack_");
00198 #if defined(TCP_DELAY_BIND_ALL) && 0
00199         delay_bind_init_one("maxSackBlocks_");
00200 #endif /* TCP_DELAY_BIND_ALL */
00201 
00202         Agent::delay_bind_init_all();
00203 }

00223 {
00224         char wrk[256];
00225 
00226         // XXX we don't know InstVar outside of Tcl! Is there any
00227         // tracedvars hidden in InstVar? If so, shall we have a tclclInt.h?
00228         TracedVar* var = tracedvar_;
00229         for ( ;  var != 0;  var = var->next_) 
00230                 flushAVar(var);
00231 
00232         // we need to flush all var values to trace file, 
00233         // so nam can do backtracing
00234         sprintf(wrk, "a -t "TIME_FORMAT" -s %d -d %d -n %s -x",
00235                 Scheduler::instance().clock(), here_.addr_,
00236                 dst_.addr_, traceName_); 
00237         if (traceName_ != NULL)
00238                 delete[] traceName_;
00239         traceName_ = NULL;
00240 }

00099 { return dst_.port_; }

00115 {
00116         if (drop_ != 0)
00117                 drop_->recv(p, s);
00118         else
00119                 Packet::free(p);
00120 }

00107 {
00108         if (drop_ != 0)
00109                 drop_->recv(p);
00110         else
00111                 Packet::free(p);
00112 }

00101 { return type_; }

00092 {
00093         recv((Packet*)e);
00094 }

00364 {
00365         if (app_)
00366                 app_->resume();
00367 }

00447 {
00448         hdr_cmn* ch = hdr_cmn::access(p);
00449         ch->uid() = uidcnt_++;
00450         ch->ptype() = type_;
00451         ch->size() = size_;
00452         ch->timestamp() = Scheduler::instance().clock();
00453         ch->iface() = UNKN_IFACE.value(); // from packet.h (agent is local)
00454         ch->direction() = hdr_cmn::NONE;
00455 
00456         ch->error() = 0;        /* pkt not corrupt to start with */
00457 
00458         hdr_ip* iph = hdr_ip::access(p);
00459         iph->saddr() = here_.addr_;
00460         iph->sport() = here_.port_;
00461         iph->daddr() = dst_.addr_;
00462         iph->dport() = dst_.port_;
00463         
00464         //DEBUG
00465         //if (dst_ != -1)
00466         //  printf("pl break\n");
00467         
00468         iph->flowid() = fid_;
00469         iph->prio() = prio_;
00470         iph->ttl() = defttl_;
00471 
00472         hdr_flags* hf = hdr_flags::access(p);
00473         hf->ecn_capable_ = 0;
00474         hf->ecn_ = 0;
00475         hf->eln_ = 0;
00476         hf->ecn_to_echo_ = 0;
00477         hf->fs_ = 0;
00478         hf->no_ts_ = 0;
00479         hf->pri_ = 0;
00480         hf->cong_action_ = 0;
00481 #ifdef HAVE_STL
00482 
00483         hdr_nv* nv = hdr_nv::access(p);
00484         if (0)
00485                 printf("Off hdr_nv %d, ip_hdr %d myaddr %ld\n",
00486                        hdr_nv::offset(), hdr_ip::offset(), here_.addr_);
00487         NixNode* pNixNode = NixNode::GetNodeObject(here_.addr_);
00488         if (0)
00489                 printf("Node Object %p\n", pNixNode);
00490         if (pNixNode) { 
00491                 // If we get non-null, indicates nixvector routing in use
00492                 // Delete any left over nv in the packet
00493                 // Get a nixvector to the target (may create new)
00494                 NixVec* pNv = pNixNode->GetNixVector(dst_.addr_);
00495                 pNv->Reset();
00496                 nv->nv() = pNv; // And set the nixvec in the packet
00497                 nv->h_used = 0; // And reset used portion to 0
00498         }
00499 #endif //HAVE_STL
00500 }

00251 {
00252         OldValue *p = new OldValue;
00253         assert(p != NULL);
00254         strncpy(p->val_, value, min(strlen(value)+1, TRACEVAR_MAXVALUELENGTH));
00255         p->var_ = v;
00256         p->next_ = NULL;
00257         if (oldValueList_ == NULL) 
00258                 oldValueList_ = p;
00259         else {
00260                 p->next_ = oldValueList_;
00261                 oldValueList_ = p;
00262         }
00263 }

00061 { return debug_; }

00243 {
00244         OldValue *p = oldValueList_;
00245         while ((p != NULL) && (p->var_ != v))
00246                 p = p->next_;
00247         return p;
00248 }

00103 { return max_sack_blocks_; }

00311 {
00312         char wrk[256];
00313         int n;
00314         double curTime = (&Scheduler::instance() == NULL ? 0 : 
00315                           Scheduler::instance().clock());
00316         
00317         sprintf(wrk, "v -t "TIME_FORMAT" -e monitor_agent %d %s",
00318                 curTime, here_.addr_, traceName_);
00319         n = strlen(wrk);
00320         wrk[n] = '\n';
00321         wrk[n+1] = 0;
00322         if (channel_)
00323                 (void)Tcl_Write(channel_, wrk, n+1);
00324 }

00097 { return here_.port_; }

00097 {
00098         Packet::free(p);
00099 }

00386 {
00387         int numToDeliver;
00388         int numBytes = hdr_cmn::access(pkt)->size();
00389         hdr_tcp *th = hdr_tcp::access(pkt);
00390         /* W.N. Check if packet is from previous incarnation */
00391         if (th->ts() < lastreset_) {
00392                 // Remove packet and do nothing
00393                 Packet::free(pkt);
00394                 return;
00395         }
00396         acker_->update_ts(th->seqno(),th->ts());
00397         numToDeliver = acker_->update(th->seqno(), numBytes);
00398         if (numToDeliver) {
00399                 bytes_ += numToDeliver; // for JOBS
00400                 recvBytes(numToDeliver);
00401         }
00402         
00403         // If there's no timer and the packet is in sequence, set a timer.
00404         // Otherwise, send the ack and update the timer.
00405         if (delay_timer_.status() != TIMER_PENDING &&
00406                                 th->seqno() == acker_->Seqno()) {
00407                 // There's no timer, so we can set one and choose
00408                 // to delay this ack.
00409                 // If we're following RFC2581 (section 4.2) exactly,
00410                 // we should only delay the ACK if we're know we're
00411                 // not doing recovery, i.e. not gap-filling.
00412                 // Since this is a change to previous ns behaviour,
00413                 // it's controlled by an optional bound flag.
00414                 // discussed April 2000 in the ns-users list archives.
00415                 if (RFC2581_immediate_ack_ && 
00416                         (th->seqno() < acker_->Maxseen())) {
00417                         // don't delay the ACK since
00418                         // we're filling in a gap
00419                 } else {
00420                         // delay the ACK and start the timer.
00421                         save_ = pkt;
00422                         delay_timer_.resched(interval_);
00423                         return;
00424                 }
00425         }
00426         // If there was a timer, turn it off.
00427         if (delay_timer_.status() == TIMER_PENDING) 
00428                 delay_timer_.cancel();
00429         ack(pkt);
00430         if (save_ != NULL) {
00431                 Packet::free(save_);
00432                 save_ = NULL;
00433         }
00434 
00435         Packet::free(pkt);
00436 }

00355 {
00356         if (app_)
00357                 app_->recv(nbytes);     
00358 }

00379                        {
00380     if (delay_timer_.status() == TIMER_PENDING)
00381         delay_timer_.cancel();
00382     TcpSink::reset();
00383 }

00089 { sendmsg(nbytes); }

00084 { sendmsg(sz, data, 0); }

00080 { target_->recv(p, h); }

00401 {
00402         fprintf(stderr, 
00403         "Agent::sendmsg(int, AppData*, const char*) not implemented\n");
00404         abort();
00405 }

00409 {
00410         fprintf(stderr, 
00411         "Agent::sendmsg(int, AppData*, const char*) not implemented\n");
00412         abort();
00413 }

00100 { type_ = pkttype; }

00095 { return size_; }

00048 { return target_; }

00439 {
00440         // The timer expired so we ACK the last packet seen.
00441         if ( save_ != NULL ) {
00442                 Packet* pkt = save_;
00443                 ack(pkt);
00444                 save_ = NULL;
00445                 Packet::free(pkt);
00446         }
00447 }

00267 {
00268         if (channel_ == 0)
00269                 return;
00270         char wrk[256], value[128];
00271         int n;
00272 
00273         // XXX we need to keep track of old values. What's the best way?
00274         v->value(value, 128);
00275 
00276         // XXX hack: how do I know ns has not started yet?
00277         // if there's nothing in value, return
00278         static int started = 0;
00279         if (!started) {
00280                 Tcl::instance().evalc("[Simulator instance] is-started");
00281                 if (Tcl::instance().result()[0] == '0')
00282                         // Simulator not started, do nothing
00283                         return;
00284                 // remember for next time (so we don't always have to call to tcl)
00285                 started = 1;
00286         };
00287 
00288         OldValue *ov = lookupOldValue(v);
00289         if (ov != NULL) {
00290                 sprintf(wrk, 
00291                         "f -t "TIME_FORMAT" -s %d -d %d -n %s -a %s -v %s -o %s -T v",
00292                         Scheduler::instance().clock(), here_.addr_,
00293                         dst_.addr_, v->name(), traceName_, value, ov->val_);
00294                 strncpy(ov->val_, 
00295                         value,
00296                         min(strlen(value)+1, TRACEVAR_MAXVALUELENGTH));
00297         } else {
00298                 // if there is value, insert it into old value list
00299                 sprintf(wrk, "f -t "TIME_FORMAT" -s %d -d %d -n %s -a %s -v %s -T v",
00300                         Scheduler::instance().clock(), here_.addr_,
00301                         dst_.addr_, v->name(), traceName_, value);
00302                 insertOldValue(v, value);
00303         }
00304         n = strlen(wrk);
00305         wrk[n] = '\n';
00306         wrk[n+1] = 0;
00307         (void)Tcl_Write(channel_, wrk, n+1);
00308 }


Public Member Functions
	DelAckSink (Acker *acker)
void	recv (Packet pkt, Handler )
virtual void	timeout (int tno)
void	reset ()
virtual void	recv (Packet p, const char s)
int	command (int argc, const char const argv)
TracedInt &	maxsackblocks ()
void	recvOnly (Packet *)
void	send (Packet p, Handler h)
virtual void	send (int sz, AppData *data)
virtual void	send (int nbytes)
virtual void	sendmsg (int sz, AppData , const char flags=0)
virtual void	sendmsg (int nbytes, const char *flags=0)
virtual void	sendto (int sz, AppData , const char flags, nsaddr_t dst)
virtual void	sendto (int nbytes, const char *flags, nsaddr_t dst)
virtual void	connect (nsaddr_t dst)
virtual void	close ()
virtual void	listen ()
virtual void	attachApp (Application *app)
virtual int &	size ()
nsaddr_t &	addr ()
nsaddr_t &	port ()
nsaddr_t &	daddr ()
nsaddr_t &	dport ()
void	set_pkttype (packet_t pkttype)
packet_t	get_pkttype ()
NsObject *	target ()
virtual void	drop (Packet *p)
int	isdebug () const
virtual void	debug (const char *fmt,...)
Protected Member Functions
void	ack (Packet *)
virtual void	add_to_ack (Packet *pkt)
virtual void	delay_bind_init_all ()
virtual int	delay_bind_dispatch (const char varName, const char localName, TclObject *tracer)
virtual void	recvBytes (int bytes)
virtual void	idle ()
Packet *	allocpkt () const
Packet *	allocpkt (int) const
void	initpkt (Packet *) const
virtual void	trace (TracedVar *v)
void	deleteAgentTrace ()
void	addAgentTrace (const char *name)
void	monitorAgentTrace ()
OldValue *	lookupOldValue (TracedVar *v)
void	insertOldValue (TracedVar v, const char value)
void	dumpTracedVars ()
virtual void	trace_event (char *eventtype)
virtual void	drop (Packet p, const char s)
void	handle (Event *)
Protected Attributes
double	interval_
DelayTimer	delay_timer_
Acker *	acker_
int	ts_echo_bugfix_
TracedInt	max_sack_blocks_
Packet *	save_
int	generate_dsacks_
int	qs_enabled_
int	RFC2581_immediate_ack_
int	bytes_
double	lastreset_
ns_addr_t	here_
ns_addr_t	dst_
int	size_
packet_t	type_
int	fid_
int	prio_
int	flags_
int	defttl_
Tcl_Channel	channel_
char *	traceName_
OldValue *	oldValueList_
Application *	app_
EventTrace *	et_
NsObject *	target_
NsObject *	drop_
int	debug_
Static Protected Attributes
int	uidcnt_
Friends
void	Sacker::configure (TcpSink *)

DelAckSink Class Reference

Public Member Functions

Protected Member Functions

Protected Attributes

Static Protected Attributes

Friends

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation

Member Data Documentation